JPS6029054B2 - electronic transmission dynamometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dynamometer, and more particularly to an electronic dynamometer that measures the output and speed of a rotating drive shaft.

Torsional axial kink has previously been measured by precisely aligned reference marks inscribed at axially spaced intervals on the Fujikami when unloaded.

However, since mark alignment is done mechanically, there are limits to its accuracy, the number of marks, and the measurement results that can be obtained. One object of the invention is to provide a dynamometer that allows accurate measurements to be taken by complete electronic interrogation, as opposed to mechanically aligned reference marks, which can only provide approximations. .

Another object of the present invention is to eliminate errors caused by movements of the shaft in the lateral direction, longitudinal direction, or other than rotation relative to the bearing housing, thereby providing accurate measurements. To provide a dynamometer.

Another object of the invention is to provide a dynamometer which allows measurements to be made very easily on any type of shaft.

Next, the structure and operation of the present invention will be explained with reference to embodiments shown in the drawings.

In the embodiment shown in FIG. 1, the apparatus of the present invention magnetically records a sinusoidal signal of an appropriate frequency during each unloaded revolution of the drive shaft 12. It consists of a recording/playback device 10 attached to the.

When the drive shaft 12 is rotating under load, a playback signal of the signal recorded from the drive shaft 12 is continuously played to generate an electronic output proportional to the torque, horsepower, and rotational speed of the drive shaft. An electronic computer 14 is electrically connected to the receiving computer 14 . As shown in Fig. 1, the recording/playback device 1
The shaft 12 is attached to the drive shaft 12 at a distance in the direction of the ball.
It has a pair of non-magnetic collars 18 that rotate together with the
Magnetic tape 20 is wrapped around each collar 18.

A transmitter 30 is connected to the recording/playback heads 22 and 24 via a conductor 32 and an ON-OFF switch 34, with one head 22 being close to the input end of the shaft 12 and the other head 24 being close to the input end of the shaft 12.
is located near the output end of shaft 12.

On the other hand, the recording/playback heads 22 and 24 are each attached to a pair of mounting members 86, which are mounted on a flat pedestal 84 disposed between the two collars 18 along the axis 12. The upper surface 90' is fixed.

The lower surface 92 of this pedestal 84 is cut out in an arc shape so as to form a supplementary angle with the outer peripheral surface of the shaft 12.

Furthermore, a pair of shafts 96 are mounted parallel to the shaft 12 on both sides of the arc-shaped cutout of the lower surface 92, and rollers 94 are mounted on both ends of each shaft 96. This roller 94 is rotatable in contact with the shaft 12 and separates the pedestal 84 from the shaft 12. A pair of springs 98 are attached to both ends of the pedestal 84 to prevent the pedestal 84 from moving laterally as the shaft 12 rotates.

The other end of the spring 98 may be fixed at a suitable location near the shaft 12. Next, the action and effect will be explained.

First, a method for measuring the torsion of the shaft 12 will be explained. When switch 34 is turned "ON", transmitter 30 periodically generates a signal at a selectable frequency (selected as described below), and this signal
Head 2 of each magnetic tape 201 wrapped around 8
2 and 24. switch 34 is OFF
”, and the shaft 12 rotates twice under load, the signal recorded on the tape is transferred to the computer 1 by the conductor.
4 input terminals connected to respective heads 22, 24
is picked up by the computer 14 and sent to the electronic computer 14.

The shaft 12 rotates once for recording and continuously for playback. As shown in Figure 2, the electronic computer 1
4 includes front layer amplifiers 36 and 38 for amplifying signals sent from the heads 22 and 24, respectively.

Since one head 22 is closer to the input end of shaft 12, the signal from this head 22 precedes the signal from the other head 24. The signals passing through the pre-calendar amplifiers 36 and 38 pass through zero-crossing detectors and limiters 40 and 42, respectively, and further pass through differentiating circuits 44 and 46.

The output (advanced signal) of one of the differentiating circuits 44 drives the "set 1 input" of the bistable multivibrator gate 48,
The output (delayed signal) of the other differentiator 46 is output to the bistable gate 4.
The output of bistable gate 48 therefore has a width equal to the phase difference or time delay across the zero crossing point. is a direct current body proportional to the torque of , which enters a pulse width-to-voltage converter 50. The output from converter 40 provides support for a digital or conventional panel torque meter 52. For this purpose, a potentiometer 54 may be used to calibrate the torque meter 52. Meanwhile, the output of the differentiator 46 is waveform-shaped by a monostable multivibrator 56.

Note that the monostable multivibrator 56 outputs the signal. The repetitive pulses are proportional to the rotational speed of the shaft 12. F-V converter 58 provides a DC voltage proportional to the rotational speed of shaft 12 to operate RPM tachometer 60 .

A potentiometer 62 is connected for direct reading of the rotational speed (r.p.m.) scale. The torque voltage from transducer 50 enters the "X" input of voltage multiplier 64 and is applied to transducer 58.
r. p. m, (revolutions per minute) voltage enters the “Y” input of multiplier 64. The output of the multiplier 64 is “Y” and “×”
In other words, it is proportional to the horsepower of the shaft. The output of multiplier 64 enters a voltmeter 66 which is calibrated in horsepower for direct reading by the position of potentiometer 68. FIG. 3 shows typical waveforms at each point of the computer 14.

The waveform is typically a sine waveform, and a frequency is selected such that the width of the maximum torque signal measured by the heads 22 and 24 is smaller than the -cycle of the reproduction frequency. Third
In the figure, the waveforms emanating from each head 22, 24 are shown by line 70, which is the input to the preamplifiers 36, 38.

The output from preamplifiers 36, 38 is shown at line 72, which is squared and shortened as shown at line 74 by zero crossing detectors and limiters 40, 42.

It is also possible to use either the positive pulse above the line and the negative pulse below the line 76, 78 provided by the differentiators 44, 46 to trigger the bistable multivibrator gate 48. The output of differentiator 44, represented by line 76, is
The output of the differentiator 46, represented by 8, advances by an amount proportional to the shaft torque. The bistable multivibrator output of positive going pulses, represented by line 80 in FIG. 3, has a frequency equal to that of the reference signal, represented by line 70, and the time delay between zero crossing points, respectively. In other words, the pulse width is proportional to the shaft torque. The output of the monostable multipipulator 56 is a series of frequencies corresponding to revolutions per minute, as represented by line 82 in FIG. The panel width is narrower than a cycle at maximum revolutions per minute.

Next, the effects of the embodiment will be explained.

This embodiment is used where the shaft 12 is likely to undergo lateral or longitudinal vibrations or movements other than rotation relative to its bearing housing 28. In such a case, if the recording/playback heads 22 and 24 are
8, the reproduced signal includes, in addition to the component corresponding to the phase difference between the tapes 20, a torque signal due to the torsion of the shaft 12 and a signal caused by the non-rotational movement of the shaft 12 as described above. It will include everything.

Therefore, as shown in FIG. 1, if a pedestal 84 is provided and the head is attached to it, this pedestal 84 will not be affected even if the shaft 12 moves in the lateral direction. Elements caused by movement are not mixed into the playback signal,
This means that a signal representing only the phase difference between the tapes can be detected without any errors associated with this.

Next, the effects of the invention will be explained.

In other words, with the configuration described in the claims of the present invention, whereas in the past it was only possible to obtain approximate values using reference marks based on mechanical alignment, in the present invention, it was possible to obtain only approximate values using reference marks based on mechanical alignment. By attaching a medium and recording a predetermined signal on this recording medium in a no-load state, the signal is then read by a recording/playback head while a load is applied to the shaft. It has an excellent feature of being able to perform accurate measurements.

Moreover, in this application, the recording/playback head is fixed to a pedestal having a rotatably supported roller at the bottom, and the bracket pedestal is held in a non-rotating state by a spring.
Even if the measuring shaft vibrates horizontally or vertically, or if vibration is caused by other non-rotational movements, the pedestal is not affected by this vibration, so even the elements caused by such vibration can be regenerated. without interfering with the signal.
Therefore, the present invention has an excellent feature that it is possible to perform good measurements without errors.

Furthermore, in the present application, when performing measurements, measurements can be made simply by placing the pedestal on the measuring shaft, which is a desirable feature that allows measurements to be made extremely easily no matter what type of shaft is used. It also has characteristics. Finally, some embodiments of the present invention will be listed.

1. An electronic power transmission dynamometer as claimed in claim 1, wherein the recording means is a tape wrapped around a non-magnetic collar attached to a shaft.

'2' An electronic transmission dynamometer according to claim 1, wherein the recording means is magnetic ink coated with a non-magnetic color attached to a shaft.

[3] A patent in which a dual-purpose recording/playback means is mounted spaced apart from each other above a shaft, and has two recording/playback heads located in the vicinity of the recording means, each mounted spaced apart in the axial direction. An electronic transmission dynamometer according to the claims.

(2) The dual-purpose recording/reproducing means according to item ``3'' above, wherein the recording/reproducing head is fixed to each bearing housing of the shaft.

■ A receiver in which the recording/playback head is attached to a rotating shaft and is held rotatably together with the shaft by springs fixed laterally between each fixed point on the opposite side of the holder. A recording/playback means having the dual purpose described in [3' above] which is attached to a stand.

'61 Dual purpose recording as described in paragraph {3' above, where the recording means and the recording/playback head do not come into physical contact, thereby eliminating wear and tear between the recording means and the recording/playback head.・Regeneration means.

'71 Electronic transmission power according to the claims, in which the frequency of the radio wave signal obtained from the signal generating means is selected from an audible range to obtain pulses with an indefinite width and pulses with a constant width, each having a width shorter than one cycle of this frequency. Total.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention. FIG. 2 is a circuit diagram showing one embodiment of the electronic circuit of the device of the present invention. FIG. 3 is a diagram showing a series of waveforms of reproduced signals in various parts of the electronic circuit diagram of FIG. 18・
...Non-magnetic color, 20...Recording tape, 22,24...Recording/playback head, 84...
....cradle, 94...roller, 98...spring. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. An electronic power transmission dynamometer that measures the torque, revolutions per minute, and horsepower of a loaded shaft during rotation;
(b) A plurality of recording media that are attached around the above-mentioned shaft axially apart from each other by non-magnetic members and rotate together with the shaft, and (c) an audible signal when the shaft rotates without being subjected to a load. a recording/reproducing means for recording the signal from the transmitter on a magnetic recording medium, and picking up and reproducing the signals recorded on the recording medium when the shaft rotates under load; (d) This reproduction signal is continuously amplified and differentiated, and this is divided into variable width pulses whose pulse width changes in proportion to the shaft torque, and pulses whose frequency increases and decreases in proportion to the shaft revolutions per minute. Converting the variable width pulse of both pulses into a voltage value proportional to this pulse width, and converting the pulse whose frequency changes in proportion to the number of revolutions per minute into a voltage value proportional to this frequency. An electronic circuit that converts and further multiplies these respective voltage values to obtain a voltage proportional to the horsepower of the shaft, and (e) receives these voltage signals and displays torque, revolutions per minute, and horsepower, respectively. (f) a recording/playback head is fixed to a pedestal having a rotatably supported roller at the bottom; An electronic transmission dynamometer characterized in that it is supported by a spring so as not to rotate when placed on a target shaft.